UV Editing - Unwrap object and display measurements in the view
I have found a rather complex workaround for my use case. Hopefully somebody will post once a cleaner solution.
So since I want to print out the unwrapped model with the dimensions to help with a sewing project I came up with this way:

I export the model as an SVG file in uv/unwrap (one face at a time)
Import the SVG file in QCAD.
I scale the dimensions to match the edge the ones in the 3d model
Now I can set all the dimensions and angles in QCAD